Sub-topic 9.3: What is matter made of? Space between particles. Unit 9: Matter Sub-topic 9.3: What is matter made of? Space between particles.

Objective of the lesson At the end of the lesson, students should be able to: give a reason, why diffusion occurs. recall the state of matter that has less space between particles. recall the state of matter that has a lot of space between particles. give reason, why diffusion is fastest in gas but slowest in solid. measure volume using measuring cylinder correctly

Recap previous lesson What does the word ‘diffusion’ mean? The movement of particles of one substance through the particles of another substance. In what direction does the particles diffuse? The particles diffuse in all direction.

Recap previous lesson In the practical activity that you and your group have done in the previous lesson showed the different rate /speed of diffusion in solid liquid and gas. Among these three states of matter, which state diffuse the fastest? Gas. Among these three states of matter, which state diffuse the slowest? Solid.

Why do particles diffuse?

To answer that question, you will do Practical Activity 9 To answer that question, you will do Practical Activity 9.5: Space between Particles.

Collect your apparatus Each group should collect/have: 2 measuring cylinder 1 bottle of ethanol 1 bottle of distilled water 1 container of substance A 1 container of substance B 1 bottle of salt 1 plastic spoon 1 stirring rod ONCE YOUR GROUP FINISH THE PRACTICAL, WRITE DOWN YOUR FINDINGS ON THE TABLE PROVIDED ON THE WHITEBOARD

Make sure that your eyes are on the same level as the lower meniscus of the substance or liquid you are measuring.

You have 10 minutes to do your practical activity You may start now! You have 10 minutes to do your practical activity

Practical Activity 9.5: Space between particles

Practical Activity 9.5: Space between particles

Why do particles diffuse?  Particles diffuse because there is space between the particles. Also the particles must be moving. Look at the diagrams of the particles in a gas, a liquid and a solid.

Particles in a gas There is a lot of space between gas particles.

Particles in a liquid There is space between liquid particles, but the space is less than in gas

Particles in a solid There is only a small space between the particles in solids.

Diffusion in gases is faster than diffusion in liquids because the space between gas particles is more than the space in liquid particles. Diffusion in solids is slower than diffusion in liquids because the space in solid particles is less than space in liquid particles Therefore, diffusion happened the fastest in gas and slowest in solid because there is a lot of space in gas but less space is available in solid.

PUT AWAY YOUR NOTES FIRST SUMMARY PUT AWAY YOUR NOTES FIRST

SUMMARY Why do particles diffuse? In which state of matter (solid, liquid or gas) will you find a lot of space between particles? In which state of matter (solid, liquid or gas) will you find a small of space between particles? Why do gas particles diffuse faster than solid particles?

THE END THANK YOU 